[Brightcolours]

The point was that it makes little sense to say "is designed for superior mobility", while it actually is designed for better wide open across the frame sharpness.
Said Canon and Sony are "designed for superior mobility" (and in case of the Canon, to provide a very affordable option), not necessarily for state of the art wide open across the frame sharpness.

Or you could argue as Panasonic that their MFT primes are "designed for superior mobility". It makes sense there.